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SM39R4051 Datasheet(PDF) 9 Page - SyncMOS Technologies,Inc |
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SM39R4051 Datasheet(HTML) 9 Page - SyncMOS Technologies,Inc |
9 / 47 page SM39R4051/SM39R2051 8-Bit Micro-controller 4KB/2KB with ISP Flash & 256B RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. ISSFD-M055 9 Ver.E SM39R4051 09/2011 Function Description 1. General Features SM39R4051 is an 8-bit micro-controller。All of its functions and the detailed meanings of SFR will be given in the following sections。 1.1. Embedded Flash The program can be loaded into the embedded 4KB/2KB Flash memory via its writer or In-System Programming (ISP)。 The high-quality Flash has a 100K-write cycle life,suitable for re-programming and data recording as EEPROM。 1.2. IO Pads The SM39R4051 has three I/O ports: Port 1, Port 3 and Port 4. Ports 1, 3 are 8-bit ports and Port 4 is a 2-bit port. These are: quasi-bidirectional (standard 8051 port outputs), push-pull, open drain, and input-only. As description in section 5。 At 20L Package (DIP/SOP),the Int0、Int1、T0、T0 signal can be configured to other I/O as below: Signal Default Option1 Option2 Option3 #INT0 6(P3.2) 2(P3.0) 15(P1.3) 16(P1.4) #INT1 7(P3.3) 3(P3.1) 14(P1.2) 17(P1.5) T0 8(P3.4) 14(P1.2) 16(P1.4) 2(P3.0) T1 9(P3.5) 15(P1.3) 17(P1.5) 3(P3.1) The RESET Pin Can Be configured as I/O port P3.6,when user use on-chip hardware RESET mechanism。 The XTAL2 and XTAL1 can be configured as I/O port by ICP or in ISP mode,when user use external OSC or on-chip RC Oscillator is set to main system clock source,show as below: External OSC Internal OSC Xtal1 Xtal1 P4.1 20L package Xtal2 P4.0 P4.0 All the pins on P1、P3 and P4 are with slew rate adjustment to reduce EMI. The other way to reduce EMI is to disable the ALE output if unused. This is selected by its SFR. The IO pads can withstand 4KV ESD in human body mode guaranteeing the SM39R4051’s quality in high electro-static environments. 1.3. Instruction timing Selection The conventional 52-series MCUs are 12T, i.e., 12 oscillator clocks per machine cycle. SM39R4051 is a 1T to 8T MCU, i.e., its machine cycle is one-clock to eight-clock. In the other words, it can execute one instruction within one clock to only eight clocks. Mnemonic: CKCON Address: 8Eh 7 6 5 4 3 2 1 0 Reset - ITS - - - - 10H ITS: Instruction timing select. ITS [6:4] Instruction timing 000 1T mode 001 2T mode (default) 010 3T mode |
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